According to the walkthrough on GameBanshee, you have to use the levers in this order: 1, 2, 2, 1, 4, 3, 4 (going clockwise around the square as per the map). You sound like you got stuck. Did you find a way out? I tried to do it myself before checking the walkthrough and am now stuck between doors. I can use two levers (2 and 3), but the only thing they do is open and close the second door. I can't get back out into the maion tunnel in order to use the levers in the right way. I have searched all over the web and it appears no one has run into (or reported) this issue. Please help me if you were able to figure it out.